initLanguageSettings function

Future<String> initLanguageSettings(Future<String> findLocale(), Future<bool> initMessages(String locale))

Initialize the Intl-Framework

// Include this if you run your app in the browser
import 'package:intl/intl_browser.dart';

import 'package:l10n/l10n.dart';
import 'package:browser_example/_l10n/messages_all.dart';

Future main() async {
    final String locale = await initLanguageSettings(
            () => findSystemLocale(),
            (final String locale) => initializeMessages(locale)
    );
    ...
}

Implementation

Future<String> initLanguageSettings(
    Future<String> findLocale(),
    Future<bool> initMessages(final String locale)) async {

    // Determine your locale
    final String locale = await findLocale(); // Calls platform specific "findSystemLocale"
    final String shortLocale = Intl.shortLocale(Uri.base.queryParameters['lang'] ?? locale);

    // Important - otherwise the Browser doesn't show the right language!
    Intl.systemLocale = shortLocale;

    // Avoids error message:
    //      LocaleDataException: Locale data has not been initialized,
    //      call initializeDateFormatting(<locale>).
    await initializeDateFormatting(shortLocale);

    // Initialize translation-table
    // calls back into application specific part
    await initMessages(shortLocale);

    return shortLocale;
}